Path has introduced a search tool that lets users search their contacts' history as a means of location-based social discovery. The idea is that it's more useful to know which restaurants your friends have visited and enjoyed than to access a huge but anonymous data set, which pairs well with the network's strict limit of 150 contacts. "It's a curious approach, and a bit charming. ... Now we'll see if it keeps users active, engaged and checking in," Mike Isaac writes.

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